One of the most effective ways to be lean and strong for life is to familiarize yourself with the branched-chainamino acids (BCAAs). Exercise causes an increase in serotonin levels, which are believed to cause fatigue. But BCAAs are believed to reduce serotonin levels, and thus cancel out the fatigue and actually enhance exercise performance. They are essential because the body is unable to make them out of themselves, meaning they must be ingested through food or amino acid supplements. BCAA blend is in a 4:1:1 ratio giving your body a high dosage of leucine. Research shows that high dosages of leucine may inhibit protein degradation in skeletal muscle, thus, promoting an anti-cataboliceffect.